Akai 1710w Reel to Reel. No bass in one speaker

ledzurso

New member
I have completely rebuilt the circuit in this reel to reel...every electrolytic capacitor and power resistor, and every resistor, transistor, and electrolytic in the pre-amp. All the tubes are new. The heads seem to be aligned properly and have been cleaned. I am getting no bass out of the right channel... it sounds like a high pass filter. When I switch the speakers the same thing happens so it's not the speaker.

The troubleshooting guide in the service manual says to check three capacitors, all of which I have replaced. Ive been thru the circuit looking for a wrong part, wrong connection or any other anomalies; everything seems to be correct. Any ideas? I'm really stuck here.
 
The problem seems to be in the pre-amp. I've tested the signal from the preamp outputs with the same 'no bass' results.
 
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